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5.3

GUI Application

The sample application that is available with the adapter uses the device transport to communicate with

the adapter, as well as the target devices behind the adapter. A screenshot is shown in Figure 5-2.

Figure 5-2. Sample GUI Application

From the main menu, update the firmware for the adapter, select the bus speed of the device (100 kHz or

400 kHz), and select whether PEC is enabled or disabled when communicating with the device.

The main portion of the form is split into five sections: I2C, SMBus, PMBus, GPIO, and pullup resistors.

From the I2C, SMBus, and PMBus group boxes, the user can select each of the available transaction

types that the adapter supports. The result of the transaction to the device is also communicated here as

an acknowledge (ACK) or not acknowledge (NACK).

In the GPIO group box, each of the eight GPIO pins can be enabled and programmed as read or write. In

addition, the state of the pin can be read or asserted to the desired value from this group box as well.

Finally, the GUI allows users to select the values of the pullup resistors used for the SDA/SCL lines. The

adapter and the GUI allow users to select from 668

Ω, 1.1 kΩ, 2.2 kΩ, or open drain.

GUI and PC Libraries

SLLU093 – August 2006

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USB-TO-GPIO bảng dữ liệu(PDF) 28 Page - Texas Instruments